Kotlin编程语言，如何实现长尾关键词优化？

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javavar email=null;email ?? println(email is empty);email?.let { println(email not empty) } ?: println(not i fuck i am null);var current=email?.let {nihao} ?: not i fuck i am null;println(current var $current);

var email=null;

email?: println("email is empty");

email?.let{
println("emali not empty");
}

var current= email?.let { "nihao" }?:"not i fuck i am null";
println("current var ${current}");